Plasma Physics Reports

, Volume 39, Issue 5, pp 337–344 | Cite as

Time evolution of the exponential wavenumber spectra of turbulence upon helium injection into a hydrogen discharge at the FT-2 tokamak

  • A. D. Gurchenko
  • E. Z. Gusakov
  • S. I. Lashkul
  • A. B. Altukhov
  • E. P. Selyunin
  • L. A. Esipov
  • M. Yu. Kantor
  • D. V. Kouprienko
  • A. Yu. Stepanov
Tokamaks
  • 70 Downloads

Abstract

The effect of variations in the key parameter of short-wavelength turbulence—the ion-acoustic Larmor radius ρ s , which determines the position of the maximum of the drift instability growth rate over poloidal wavenumbers—was studied experimentally at the FT-2 tokamak. For this purpose, helium was injected to hydrogen plasma, which resulted in a change in the electron temperature at the plasma edge. The universality of the exponential shape of the turbulence spectra over radial wavenumbers q and a substantial excess of the characteristic turbulence scale L over the ion-acoustic Larmor radius was confirmed with the help of correlative diagnostics of enhanced scattering. This excess at the discharge periphery reaches a value of 3–5 at a low electron temperature, apparently, due to an increase in the dissipation of drift waves upon their cascade transfer toward short scale-lengths.

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Copyright information

© Pleiades Publishing, Ltd. 2013

Authors and Affiliations

  • A. D. Gurchenko
    • 1
    • 2
  • E. Z. Gusakov
    • 1
    • 2
  • S. I. Lashkul
    • 1
    • 2
  • A. B. Altukhov
    • 1
    • 2
  • E. P. Selyunin
    • 1
    • 2
  • L. A. Esipov
    • 1
    • 2
  • M. Yu. Kantor
    • 1
    • 2
  • D. V. Kouprienko
    • 1
    • 2
  • A. Yu. Stepanov
    • 1
    • 2
  1. 1.Ioffe Physical Technical InstituteRussian Academy of SciencesSt. PetersburgRussia
  2. 2.St. Petersburg State Polytechnical UniversitySt. PetersburgRussia

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